beginningReaders {languageR}R Documentation

Visual lexical decision with beginning readers

Description

Visual lexical decision latencies for beginning readers (8 year-old Dutch children).

Usage

data(beginningReaders)

Format

A data frame with 7923 observations on the following 13 variables.

Word
a factor for the words.
Subject
a factor for the subjects.
LogRT
a numeric vector with the log-transformed reaction time (in ms).
Trial
a numeric vector coding the rank of the trial in the experimental list.
OrthLength
a numeric vector coding the word's length in letters.
LogFrequency
a numeric vector with log-transformed frequency in Vermeer's frequency dictionary of Dutch children's texts.
LogFamilySize
a numeric vector with the log-transformed morphological family size count (with family members judged to be unknown to young children removed).
ReadingScore
a numeric vector with a score for reading proficiency.
ProportionOfErrors
a numeric vector for the proportion of error responses for the word.
PC1
a numeric vector for the first principal component of a PCA orthogonalization of the preceding 4 reaction times
PC2
a numeric vector for the second principal component of a PCA orthogonalization of the preceding 4 reaction times
PC3
a numeric vector for the third principal component of a PCA orthogonalization of the preceding 4 reaction times
PC4
a numeric vector for the fourth principal component of a PCA orthogonalization of the preceding 4 reaction times

References

Perdijk, K., Schreuder, R., Verhoeven, L. and Baayen, R. H. (2006) Tracing individual differences in reading skills of young children with linear mixed-effects models. Manuscript, Radboud University Nijmegen.

Examples

## Not run: 
data(beginningReaders)
library(lme4, keep.source = FALSE)
beginningReaders.lmer = lmer(LogRT ~  PC1 + PC2 + PC3  + ReadingScore +
  OrthLength + I(OrthLength^2) + LogFrequency + LogFamilySize +
  (1|Word) + (1|Subject) + (0+LogFrequency|Subject) + (0+OrthLength|Subject) + (0+PC1|Subject), 
  data = beginningReaders)
## End(Not run)

[Package languageR version 0.953 Index]